手机版小小备忘录（J2ME源码）

/* * HelloMidlet.java * My first J2ME apllication * Created on 7. September 2007, 09:12 * * Revised from the example in Core J2ME: * 1. The data read and write from/to rsOftenUsed (a RecordStore where the often used todo texts are saved) * is written with a new algorithm -- packing and unpacking the data not with objects anymore. * But the rsTodo still follows the old way, as described in "Core J2ME". * ==> Some code are duplicated in this class and in MyRecordStore, just because of the two ways in saving data. * 2. A choicegroup which contains the often used todos was added, because I find * the inconvienint of entering words is one of the biggest drawbacks of cell phone * applications. * 3. Another dimension priority is added.==> priority{1, 2, 3, 4,5}; date{"Today","Tomorrow","This week", "This month","Someday"} * 4. The programm was divided into GUI class and backend class. * MyRecordStore and TodoItem can be easyly reused in other application. * ThProgram in is way looks more like the J2EE structure (JSP+ JDBC+ base class). * 5. The DisplayManger is not used here. Because with the NetBeans' visual MIDlet are the screen flows calearly managed. * 6. The preference form is deleted, because I think most people don't like the todos unsorted * 7. I didn't use writeVector2RMS(): The data are not written to vector then written to RMS. * I wrote a addRecord() method, so that data are directly written into RMS, which is more effiecient. * 8. The todo is listed by a List screen, instead of Choice Group as showed in Core J2ME * * My todo for this program: * Because I'm a Chinese but my cell phone cannot display Chinese. so I'll try to add the Chinese characters into the choicegroup (cgOftenUsed). * To make it that way, I'll have to save Chinese characters as images. * Which also means, I'll also have to rewrite MyRecordStore.Because it is no more readUTF(), but the english or german Strings are readUTF(). * ==> It is not just a problem of languages, but also a problem between Images and Strings. */ package hello; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.util.Hashtable; import java.util.Vector; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import javax.microedition.rms.InvalidRecordIDException; import javax.microedition.rms.RecordEnumeration; import javax.microedition.rms.RecordStore; import javax.microedition.rms.RecordStoreException; import javax.microedition.rms.RecordStoreNotOpenException; /** * * @author snowtree */ public class HelloMidlet extends MIDlet implements CommandListener { /** Constructor of the TodoMidlet */ public HelloMidlet() { try { rsOftenUsed = RecordStore.openRecordStore("rsOftenUsed", true); // Initialize the streams initInputStreams(); initOutputStreams(); } catch (RecordStoreException ex) { ex.printStackTrace(); } } private Vector vecTodo;//todo in each date private Vector vecDate; private short nToday=0, nTomorrow=0, nWeek=0, nMonth=0, nSomeday=0; private MyRecordStore rsTodo=new MyRecordStore("rsTodo"); private RecordStore rsOftenUsed; //private MyRecordStore rsOftenUsed=new MyRecordStore("rsOftenUsed"); private Form addTodoForm;//GEN-BEGIN:MVDFields private Command exitCommand; private List todoListScreen; private Command exitCommand1; private Command itemCommand1; private Command addTodoCommand; private TextField tfTodo; private ChoiceGroup cgDate; private Command saveAddTodoCommand; private Command cancelCommand1; private Command addAnotherCommand; private Command deleteCommand; private ChoiceGroup cgPriority; private ImageItem imageItem1; private ImageItem imageItem2; private org.netbeans.microedition.lcdui.SplashScreen splashScreen1; private Image image1; private Font font1; private ChoiceGroup choiceGroup1; private Spacer spacer1; private Spacer spacer2; private ChoiceGroup cgOftenUsed; private Spacer spacer3; private Command oftenCommand; private Command cmdOftenfrList; private Command cmdDeleteOften; private Command okCommand1; private Command cmdOftenUsed; private Command itemCommand5; private Command cmdSaveFrOften;//GEN-END:MVDFields //GEN-LINE:MVDMethods /** This method initializes UI of the application.//GEN-BEGIN:MVDInitBegin */ private void initialize() {//GEN-END:MVDInitBegin // Insert pre-init code here getDisplay().setCurrent(get_splashScreen1()); }//GEN-LINE:MVDInitEnd /** Called by the system to indicate that a command has been invoked on a particular displayable.//GEN-BEGIN:MVDCABegin * @param command the Command that ws invoked * @param displayable the Displayable on which the command was invoked */ public void commandAction(Command command, Displayable displayable) {//GEN-END:MVDCABegin // Insert global pre-action code here if (displayable == addTodoForm) {//GEN-BEGIN:MVDCABody if (command == exitCommand) {//GEN-END:MVDCABody // Insert pre-action code here exitMIDlet();//GEN-LINE:MVDCAAction3 // Insert post-action code here } else if (command == saveAddTodoCommand) {//GEN-LINE:MVDCACase3 // Insert pre-action code here saveAddTodo(); rebuildTodoList(); getDisplay().setCurrent(get_todoListScreen());//GEN-LINE:MVDCAAction20 // Insert post-action code here } else if (command == cancelCommand1) {//GEN-LINE:MVDCACase20 // Insert pre-action code here getDisplay().setCurrent(get_todoListScreen());//GEN-LINE:MVDCAAction22 // Insert post-action code here } else if (command == addAnotherCommand) {//GEN-LINE:MVDCACase22 // Insert pre-action code here saveAddTodo(); // Do nothing//GEN-LINE:MVDCAAction24 // Insert post-action code here } else if (command == cmdDeleteOften) {//GEN-LINE:MVDCACase24 deleteOftenUsed(); rebuildOftenUsedCg(); // Do nothing//GEN-LINE:MVDCAAction80 // Insert post-action code here } else if (command == cmdOftenUsed) {//GEN-LINE:MVDCACase80 // Insert pre-action code here saveAsOftenUsedTf(); rebuildOftenUsedCg(); // Do nothing//GEN-LINE:MVDCAAction93 // Insert post-action code here } else if (command == cmdSaveFrOften) {//GEN-LINE:MVDCACase93 // Insert pre-action code here saveFromOften(); getDisplay().setCurrent(get_todoListScreen());//GEN-LINE:MVDCAAction97 rebuildTodoList(); }//GEN-BEGIN:MVDCACase97 } else if (displayable == todoListScreen) { if (command == addTodoCommand) {//GEN-END:MVDCACase97 // Insert pre-action code here getDisplay().setCurrent(get_addTodoForm());//GEN-LINE:MVDCAAction13 // Insert post-action code here rebuildOftenUsedCg(); } else if (command == exitCommand1) {//GEN-LINE:MVDCACase13 // Insert pre-action code here exitMIDlet();//GEN-LINE:MVDCAAction9 // Insert post-action code here } else if (command == deleteCommand) {//GEN-LINE:MVDCACase9 // Insert pre-action code here deleteTodoItem(); reb